Module IMCORR - Feature Tracking
The module performs an image correlation based on two raster data sets.
Additionally, two DTMs can be given and used to optain 3D displacement vectors.
This is a SAGA implementation of the standalone IMCORR software provided by the National Snow and Ice Data Center in Boulder, Colorado / US.
The standalone software and documentation is available from:
http://nsidc.org/data/velmap/imcorr.html
References:
Scambos, T. A., Dutkiewicz, M. J., Wilson, J. C., and R. A. Bindschadler (1992): Application of image cross-correlation to the measurement of glacier velocity using satellite image data. Remote Sensing Environ., 42(3), 177-186.
Fahnestock, M. A., Scambos, T.A., and R. A. Bindschadler (1992): Semi-automated ice velocity determination from satellite imagery. Eos, 73, 493.
- Author: Magnus Bremer (c) 2012
- Specification: grid
- Menu: Grid|Analysis
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Grid 1 | Grid (input) | GRID_1 | The first grid to correlate | - |
| Grid 2 | Grid (input) | GRID_2 | The second grid to correlate | - |
| DTM 1 (*) | Grid (optional input) | DTM_1 | The first DTM used to assign height information to grid 1 | - |
| DTM 2 (*) | Grid (optional input) | DTM_2 | The second DTM used to assign height information to grid 2 | - |
| Output | Correlated Points | Shapes (output) | CORRPOINTS | Correlated points with displacement and correlation information | - |
| Displacement Vector | Shapes (output) | CORRLINES | Displacement vectors between correlated points | - |
| Options | Search Chip Size (Cells) | Choice | SEARCH_CHIPSIZE | Chip size of search chip, used to find correlating reference chip | Available Choices:
[0] 16x16
[1] 32x32
[2] 64x64
[3] 128x128
[4] 256x256
Default: 2 |
| Reference Chip Size (Cells) | Choice | REF_CHIPSIZE | Chip size of reference chip to be found in search chip | Available Choices:
[0] 16x16
[1] 32x32
[2] 64x64
[3] 128x128
Default: 1 |
| Grid Spacing (Map Units) | Floating point | GRID_SPACING | Grid spacing used for the construction of correlated points [map units] | Minimum: 0.100000
Maximum: 256.000000
Default: 10.000000 |
| (*) optional |
Command-line
Usage: saga_cmd grid_analysis 19 -GRID_1 <str> -GRID_2 <str> [-DTM_1 <str>] [-DTM_2 <str>] [-CORRPOINTS <str>] [-CORRLINES <str>] [-SEARCH_CHIPSIZE <str>] [-REF_CHIPSIZE <str>] [-GRID_SPACING <str>]
-GRID_1:<str> Grid 1
Grid (input)
-GRID_2:<str> Grid 2
Grid (input)
-DTM_1:<str> DTM 1
Grid (optional input)
-DTM_2:<str> DTM 2
Grid (optional input)
-CORRPOINTS:<str> Correlated Points
Shapes (output)
-CORRLINES:<str> Displacement Vector
Shapes (output)
-SEARCH_CHIPSIZE:<str> Search Chip Size (Cells)
Choice
Available Choices:
[0] 16x16
[1] 32x32
[2] 64x64
[3] 128x128
[4] 256x256
Default: 2
-REF_CHIPSIZE:<str> Reference Chip Size (Cells)
Choice
Available Choices:
[0] 16x16
[1] 32x32
[2] 64x64
[3] 128x128
Default: 1
-GRID_SPACING:<str> Grid Spacing (Map Units)
Floating point
Minimum: 0.100000
Maximum: 256.000000
Default: 10.000000